50 points ! when an electric current is passed through water during the process of electrolysis, two gases are formed. one gas has a boiling point of –183°c and the other has a boiling point of –253°c. has a physical change or a chemical change occurred? explain.

A physical change has occured, Boiling water is a physical change not a chemical one, now if you're talking about the electric current, that had not changes either. it may rearrange the molecules, but it does not change the fundamental properties of the substance.

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the answer is:  

line graphs show patterns in data with variables that change over time; whereas, circle graphs show data as parts out of a whole (such as out of 100%).